等轮廓体绘制

J. Arvo, K. Novins
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引用次数: 8

摘要

在本文中,我们提出了一种新的体绘制方法,在该方法中,对每个视图直接计算图像空间中恒定强度的曲线或等值线。生成的等高线可用于驱动各种可视化和特征检测算法。该方法对数据点的组织没有限制,可以容纳大量的径向对称过滤函数。该技术适用于透视和正射影投影。每条等高轮廓线由一个常微分方程定义,用预测校正法对其进行数值求解。该算法的一个关键要素是使用图像强度梯度,我们通过在图像平面上的每个点上保持的封闭形式表达式来计算图像强度梯度。描述了一种高速缓存算法,该算法可以显著地加速大数据集上的梯度计算。该算法在纯排放数据集上进行了验证。最后,我们描述了一些可能的增强。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Iso-contour volume rendering
In this paperwe presenta new approach to volume rendering in which curves of constant intensity in image space,or iso-contours, are computed directly for eachview. The generated iso-contours can be used to drive various visualization and feature-detection algorithms. The approach imposes no restriction on the organization of the data points and can accommodatea large class of radially-symmetric filter functions. The technique works well for both perspective and orthographic viewing projections. Each iso-contour is definedby an ordinary differential equation, which is solved numerically using a predictor-corrector method. A key element of the algorithm is the use of image intensity gradients, which we computeby means of a closedform expression that holds at every point on the image plane. A caching algorithm is described that dramatically accelerates the gradient computations on large datasets. The algorithm is demonstrated on emission-only datasets. We conclude by describing a number of possible enhancements.
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